SSL_GET_EX_DATA_X509_STO(3) Library Functions ManualSSL_GET_EX_DATA_X509_STO(3)
NAME
SSL_get_ex_data_X509_STORE_CTX_idx — get ex_data index to access SSL structure from X509_STORE_CTX
SYNOPSIS
#include <openssl/ssl.h>
int
SSL_get_ex_data_X509_STORE_CTX_idx(void);
DESCRIPTION
SSL_get_ex_data_X509_STORE_CTX_idx() returns the index number under which the pointer to the SSL object is stored into the X509_STORE_CTX object.
Whenever a X509_STORE_CTX object is created for the verification of the peer’s certificate during a handshake, a pointer to the SSL object is stored into the X509_STORE_CTX object to identify the connection affected. To retrieve this pointer the X509_STORE_CTX_get_ex_data(3) function can be used with the correct index. This index is globally the same for all X509_STORE_CTX objects and can be retrieved using SSL_get_ex_data_X509_STORE_CTX_idx(). The index value is set when SSL_get_ex_data_X509_STORE_CTX_idx() is first called either by the application program directly or indirectly during other SSL setup functions or during the handshake.
The value depends on other index values defined for X509_STORE_CTX objects before the SSL index is created.
RETURN VALUES
≥0
The index value to access the pointer.
<0
An error occurred, check the error stack for a detailed error message.
EXAMPLES
The index returned from SSL_get_ex_data_X509_STORE_CTX_idx() provides access to SSL object for the connection during the verify_callback() when checking the peer’s certificate. Check the example in SSL_CTX_set_verify(3).
SEE ALSO
CRYPTO_set_ex_data(3), ssl(3), SSL_CTX_set_verify(3)
HISTORY
SSL_get_ex_data_X509_STORE_CTX_idx() first appeared in SSLeay 0.9.1 and has been available since OpenBSD 2.6. GNU February 6,SSL_GET_EX_DATA_X509_STORE_CTX_IDX2022 (3)